<html>
  <head>
    <style>
      button {
        width: 120px; 
        height: 32px; 
        font-size: 16px; 
        font-weight: bold;
      }
    </style>
  </head>
  <body>
    <button id="Button">Capture it!</button>
    <div id="Content"></div>
    <script src="popup.js"></script>
  </body>
</html>